sim/common/sim-options.c

   1 /* Simulator option handling.
   2    Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   3    Contributed by Cygnus Support.
   4
   5 This file is part of GDB, the GNU debugger.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License along
  18 with this program; if not, write to the Free Software Foundation, Inc.,
  19 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include "sim-main.h"
  22 #ifdef HAVE_STRING_H
  23 #include <string.h>
  24 #else
  25 #ifdef HAVE_STRINGS_H
  26 #include <strings.h>
  27 #endif
  28 #endif
  29 #ifdef HAVE_STDLIB_H
  30 #include <stdlib.h>
  31 #endif
  32 #include <ctype.h>
  33 #include "libiberty.h"
  34 #include "sim-options.h"
  35 #include "sim-io.h"
  36 #include "sim-assert.h"
  37
  38 #include "bfd.h"
  39
  40 /* Add a set of options to the simulator.
  41    TABLE is an array of OPTIONS terminated by a NULL `opt.name' entry.
  42    This is intended to be called by modules in their `install' handler.  */
  43
  44 SIM_RC
  45 sim_add_option_table (SIM_DESC sd, sim_cpu *cpu, const OPTION *table)
  46 {
  47   struct option_list *ol = ((struct option_list *)
  48                             xmalloc (sizeof (struct option_list)));
  49
  50   /* Note: The list is constructed in the reverse order we're called so
  51      later calls will override earlier ones (in case that ever happens).
  52      This is the intended behaviour.  */
  53
  54   if (cpu)
  55     {
  56       ol->next = CPU_OPTIONS (cpu);
  57       ol->options = table;
  58       CPU_OPTIONS (cpu) = ol;
  59     }
  60   else
  61     {
  62       ol->next = STATE_OPTIONS (sd);
  63       ol->options = table;
  64       STATE_OPTIONS (sd) = ol;
  65     }
  66
  67   return SIM_RC_OK;
  68 }
  69
  70 /* Standard option table.
  71    Modules may specify additional ones.
  72    The caller of sim_parse_args may also specify additional options
  73    by calling sim_add_option_table first.  */
  74
  75 static DECLARE_OPTION_HANDLER (standard_option_handler);
  76
  77 /* FIXME: We shouldn't print in --help output options that aren't usable.
  78    Some fine tuning will be necessary.  One can either move less general
  79    options to another table or use a HAVE_FOO macro to ifdef out unavailable
  80    options.  */
  81
  82 /* ??? One might want to conditionally compile out the entries that
  83    aren't enabled.  There's a distinction, however, between options a
  84    simulator can't support and options that haven't been configured in.
  85    Certainly options a simulator can't support shouldn't appear in the
  86    output of --help.  Whether the same thing applies to options that haven't
  87    been configured in or not isn't something I can get worked up over.
  88    [Note that conditionally compiling them out might simply involve moving
  89    the option to another table.]
  90    If you decide to conditionally compile them out as well, delete this
  91    comment and add a comment saying that that is the rule.  */
  92
  93 typedef enum {
  94   OPTION_DEBUG_INSN = OPTION_START,
  95   OPTION_DEBUG_FILE,
  96   OPTION_DO_COMMAND,
  97   OPTION_ARCHITECTURE,
  98   OPTION_TARGET,
  99   OPTION_ARCHITECTURE_INFO,
 100   OPTION_ENVIRONMENT,
 101   OPTION_ALIGNMENT,
 102   OPTION_VERBOSE,
 103 #if defined (SIM_HAVE_BIENDIAN)
 104   OPTION_ENDIAN,
 105 #endif
 106   OPTION_DEBUG,
 107 #ifdef SIM_HAVE_FLATMEM
 108   OPTION_MEM_SIZE,
 109 #endif
 110   OPTION_HELP,
 111 #ifdef SIM_H8300 /* FIXME: Should be movable to h8300 dir.  */
 112   OPTION_H8300,
 113 #endif
 114   OPTION_LOAD_LMA,
 115   OPTION_LOAD_VMA,
 116 } STANDARD_OPTIONS;
 117
 118 static const OPTION standard_options[] =
 119 {
 120   { {"verbose", no_argument, NULL, OPTION_VERBOSE},
 121       'v', NULL, "Verbose output",
 122       standard_option_handler },
 123
 124 #if defined (SIM_HAVE_BIENDIAN) /* ??? && WITH_TARGET_BYTE_ORDER == 0 */
 125   { {"endian", required_argument, NULL, OPTION_ENDIAN},
 126       'E', "big|little", "Set endianness",
 127       standard_option_handler },
 128 #endif
 129
 130 #ifdef SIM_HAVE_ENVIRONMENT
 131   /* This option isn't supported unless all choices are supported in keeping
 132      with the goal of not printing in --help output things the simulator can't
 133      do [as opposed to things that just haven't been configured in].  */
 134   { {"environment", required_argument, NULL, OPTION_ENVIRONMENT},
 135       '\0', "user|virtual|operating", "Set running environment",
 136       standard_option_handler },
 137 #endif
 138
 139   { {"alignment", required_argument, NULL, OPTION_ALIGNMENT},
 140       '\0', "strict|nonstrict|forced", "Set memory access alignment",
 141       standard_option_handler },
 142
 143   { {"debug", no_argument, NULL, OPTION_DEBUG},
 144       'D', NULL, "Print debugging messages",
 145       standard_option_handler },
 146   { {"debug-insn", no_argument, NULL, OPTION_DEBUG_INSN},
 147       '\0', NULL, "Print instruction debugging messages",
 148       standard_option_handler },
 149   { {"debug-file", required_argument, NULL, OPTION_DEBUG_FILE},
 150       '\0', "FILE NAME", "Specify debugging output file",
 151       standard_option_handler },
 152
 153 #ifdef SIM_H8300 /* FIXME: Should be movable to h8300 dir.  */
 154   { {"h8300h", no_argument, NULL, OPTION_H8300},
 155       'h', NULL, "Indicate the CPU is h8/300h or h8/300s",
 156       standard_option_handler },
 157 #endif
 158
 159 #ifdef SIM_HAVE_FLATMEM
 160   { {"mem-size", required_argument, NULL, OPTION_MEM_SIZE},
 161       'm', "MEMORY SIZE", "Specify memory size",
 162       standard_option_handler },
 163 #endif
 164
 165   { {"do-command", required_argument, NULL, OPTION_DO_COMMAND},
 166       '\0', "COMMAND", ""/*undocumented*/,
 167       standard_option_handler },
 168
 169   { {"help", no_argument, NULL, OPTION_HELP},
 170       'H', NULL, "Print help information",
 171       standard_option_handler },
 172
 173   { {"architecture", required_argument, NULL, OPTION_ARCHITECTURE},
 174       '\0', "MACHINE", "Specify the architecture to use",
 175       standard_option_handler },
 176   { {"architecture-info", no_argument, NULL, OPTION_ARCHITECTURE_INFO},
 177       '\0', NULL, "List supported architectures",
 178       standard_option_handler },
 179   { {"info-architecture", no_argument, NULL, OPTION_ARCHITECTURE_INFO},
 180       '\0', NULL, NULL,
 181       standard_option_handler },
 182
 183   { {"target", required_argument, NULL, OPTION_TARGET},
 184       '\0', "BFDNAME", "Specify the object-code format for the object files",
 185       standard_option_handler },
 186
 187 #ifdef SIM_HANDLES_LMA
 188   { {"load-lma", no_argument, NULL, OPTION_LOAD_LMA},
 189       '\0', NULL,
 190 #if SIM_HANDLES_LMA
 191     "Use VMA or LMA addresses when loading image (default LMA)",
 192 #else
 193     "Use VMA or LMA addresses when loading image (default VMA)",
 194 #endif
 195       standard_option_handler, "load-{lma,vma}" },
 196   { {"load-vma", no_argument, NULL, OPTION_LOAD_VMA},
 197       '\0', NULL, "", standard_option_handler,  "" },
 198 #endif
 199
 200   { {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL }
 201 };
 202
 203 static SIM_RC
 204 standard_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt,
 205                          char *arg, int is_command)
 206 {
 207   int i,n;
 208
 209   switch ((STANDARD_OPTIONS) opt)
 210     {
 211     case OPTION_VERBOSE:
 212       STATE_VERBOSE_P (sd) = 1;
 213       break;
 214
 215 #ifdef SIM_HAVE_BIENDIAN
 216     case OPTION_ENDIAN:
 217       if (strcmp (arg, "big") == 0)
 218         {
 219           if (WITH_TARGET_BYTE_ORDER == LITTLE_ENDIAN)
 220             {
 221               sim_io_eprintf (sd, "Simulator compiled for little endian only.\n");
 222               return SIM_RC_FAIL;
 223             }
 224           /* FIXME:wip: Need to set something in STATE_CONFIG.  */
 225           current_target_byte_order = BIG_ENDIAN;
 226         }
 227       else if (strcmp (arg, "little") == 0)
 228         {
 229           if (WITH_TARGET_BYTE_ORDER == BIG_ENDIAN)
 230             {
 231               sim_io_eprintf (sd, "Simulator compiled for big endian only.\n");
 232               return SIM_RC_FAIL;
 233             }
 234           /* FIXME:wip: Need to set something in STATE_CONFIG.  */
 235           current_target_byte_order = LITTLE_ENDIAN;
 236         }
 237       else
 238         {
 239           sim_io_eprintf (sd, "Invalid endian specification `%s'\n", arg);
 240           return SIM_RC_FAIL;
 241         }
 242       break;
 243 #endif
 244
 245     case OPTION_ENVIRONMENT:
 246       if (strcmp (arg, "user") == 0)
 247         STATE_ENVIRONMENT (sd) = USER_ENVIRONMENT;
 248       else if (strcmp (arg, "virtual") == 0)
 249         STATE_ENVIRONMENT (sd) = VIRTUAL_ENVIRONMENT;
 250       else if (strcmp (arg, "operating") == 0)
 251         STATE_ENVIRONMENT (sd) = OPERATING_ENVIRONMENT;
 252       else
 253         {
 254           sim_io_eprintf (sd, "Invalid environment specification `%s'\n", arg);
 255           return SIM_RC_FAIL;
 256         }
 257       if (WITH_ENVIRONMENT != ALL_ENVIRONMENT
 258           && WITH_ENVIRONMENT != STATE_ENVIRONMENT (sd))
 259         {
 260           char *type;
 261           switch (WITH_ENVIRONMENT)
 262             {
 263             case USER_ENVIRONMENT: type = "user"; break;
 264             case VIRTUAL_ENVIRONMENT: type = "virtual"; break;
 265             case OPERATING_ENVIRONMENT: type = "operating"; break;
 266             }
 267           sim_io_eprintf (sd, "Simulator compiled for the %s environment only.\n",
 268                           type);
 269           return SIM_RC_FAIL;
 270         }
 271       break;
 272
 273     case OPTION_ALIGNMENT:
 274       if (strcmp (arg, "strict") == 0)
 275         {
 276           if (WITH_ALIGNMENT == 0 || WITH_ALIGNMENT == STRICT_ALIGNMENT)
 277             {
 278               current_alignment = STRICT_ALIGNMENT;
 279               break;
 280             }
 281         }
 282       else if (strcmp (arg, "nonstrict") == 0)
 283         {
 284           if (WITH_ALIGNMENT == 0 || WITH_ALIGNMENT == NONSTRICT_ALIGNMENT)
 285             {
 286               current_alignment = NONSTRICT_ALIGNMENT;
 287               break;
 288             }
 289         }
 290       else if (strcmp (arg, "forced") == 0)
 291         {
 292           if (WITH_ALIGNMENT == 0 || WITH_ALIGNMENT == FORCED_ALIGNMENT)
 293             {
 294               current_alignment = FORCED_ALIGNMENT;
 295               break;
 296             }
 297         }
 298       else
 299         {
 300           sim_io_eprintf (sd, "Invalid alignment specification `%s'\n", arg);
 301           return SIM_RC_FAIL;
 302         }
 303       switch (WITH_ALIGNMENT)
 304         {
 305         case STRICT_ALIGNMENT:
 306           sim_io_eprintf (sd, "Simulator compiled for strict alignment only.\n");
 307           break;
 308         case NONSTRICT_ALIGNMENT:
 309           sim_io_eprintf (sd, "Simulator compiled for nonstrict alignment only.\n");
 310           break;
 311         case FORCED_ALIGNMENT:
 312           sim_io_eprintf (sd, "Simulator compiled for forced alignment only.\n");
 313           break;
 314         }
 315       return SIM_RC_FAIL;
 316
 317     case OPTION_DEBUG:
 318       if (! WITH_DEBUG)
 319         sim_io_eprintf (sd, "Debugging not compiled in, `-D' ignored\n");
 320       else
 321         {
 322           for (n = 0; n < MAX_NR_PROCESSORS; ++n)
 323             for (i = 0; i < MAX_DEBUG_VALUES; ++i)
 324               CPU_DEBUG_FLAGS (STATE_CPU (sd, n))[i] = 1;
 325         }
 326       break;
 327
 328     case OPTION_DEBUG_INSN :
 329       if (! WITH_DEBUG)
 330         sim_io_eprintf (sd, "Debugging not compiled in, `--debug-insn' ignored\n");
 331       else
 332         {
 333           for (n = 0; n < MAX_NR_PROCESSORS; ++n)
 334             CPU_DEBUG_FLAGS (STATE_CPU (sd, n))[DEBUG_INSN_IDX] = 1;
 335         }
 336       break;
 337
 338     case OPTION_DEBUG_FILE :
 339       if (! WITH_DEBUG)
 340         sim_io_eprintf (sd, "Debugging not compiled in, `--debug-file' ignored\n");
 341       else
 342         {
 343           FILE *f = fopen (arg, "w");
 344
 345           if (f == NULL)
 346             {
 347               sim_io_eprintf (sd, "Unable to open debug output file `%s'\n", arg);
 348               return SIM_RC_FAIL;
 349             }
 350           for (n = 0; n < MAX_NR_PROCESSORS; ++n)
 351             CPU_DEBUG_FILE (STATE_CPU (sd, n)) = f;
 352         }
 353       break;
 354
 355 #ifdef SIM_H8300 /* FIXME: Can be moved to h8300 dir.  */
 356     case OPTION_H8300:
 357       set_h8300h (1);
 358       break;
 359 #endif
 360
 361 #ifdef SIM_HAVE_FLATMEM
 362     case OPTION_MEM_SIZE:
 363       {
 364         unsigned long ul = strtol (arg, NULL, 0);
 365         /* 16384: some minimal amount */
 366         if (! isdigit (arg[0]) || ul < 16384)
 367           {
 368             sim_io_eprintf (sd, "Invalid memory size `%s'", arg);
 369             return SIM_RC_FAIL;
 370           }
 371         STATE_MEM_SIZE (sd) = ul;
 372       }
 373       break;
 374 #endif
 375
 376     case OPTION_DO_COMMAND:
 377       sim_do_command (sd, arg);
 378       break;
 379
 380     case OPTION_ARCHITECTURE:
 381       {
 382         const struct bfd_arch_info *ap = bfd_scan_arch (arg);
 383         if (ap == NULL)
 384           {
 385             sim_io_eprintf (sd, "Architecture `%s' unknown\n", arg);
 386             return SIM_RC_FAIL;
 387           }
 388         STATE_ARCHITECTURE (sd) = ap;
 389         break;
 390       }
 391
 392     case OPTION_ARCHITECTURE_INFO:
 393       {
 394         const char **list = bfd_arch_list();
 395         const char **lp;
 396         if (list == NULL)
 397           abort ();
 398         sim_io_printf (sd, "Possible architectures:");
 399         for (lp = list; *lp != NULL; lp++)
 400           sim_io_printf (sd, " %s", *lp);
 401         sim_io_printf (sd, "\n");
 402         free (list);
 403         break;
 404       }
 405
 406     case OPTION_TARGET:
 407       {
 408         STATE_TARGET (sd) = xstrdup (arg);
 409         break;
 410       }
 411
 412     case OPTION_LOAD_LMA:
 413       {
 414         STATE_LOAD_AT_LMA_P (sd) = 1;
 415         break;
 416       }
 417
 418     case OPTION_LOAD_VMA:
 419       {
 420         STATE_LOAD_AT_LMA_P (sd) = 0;
 421         break;
 422       }
 423
 424     case OPTION_HELP:
 425       sim_print_help (sd, is_command);
 426       if (STATE_OPEN_KIND (sd) == SIM_OPEN_STANDALONE)
 427         exit (0);
 428       /* FIXME: 'twould be nice to do something similar if gdb.  */
 429       break;
 430     }
 431
 432   return SIM_RC_OK;
 433 }
 434
 435 /* Add the standard option list to the simulator.  */
 436
 437 SIM_RC
 438 standard_install (SIM_DESC sd)
 439 {
 440   SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
 441   if (sim_add_option_table (sd, NULL, standard_options) != SIM_RC_OK)
 442     return SIM_RC_FAIL;
 443 #ifdef SIM_HANDLES_LMA
 444   STATE_LOAD_AT_LMA_P (sd) = SIM_HANDLES_LMA;
 445 #endif
 446   return SIM_RC_OK;
 447 }
 448
 449 /* Return non-zero if arg is a duplicate argument.
 450    If ARG is NULL, initialize.  */
 451
 452 #define ARG_HASH_SIZE 97
 453 #define ARG_HASH(a) ((256 * (unsigned char) a[0] + (unsigned char) a[1]) % ARG_HASH_SIZE)
 454
 455 static int
 456 dup_arg_p (arg)
 457      char *arg;
 458 {
 459   int hash;
 460   static char **arg_table = NULL;
 461
 462   if (arg == NULL)
 463     {
 464       if (arg_table == NULL)
 465         arg_table = (char **) xmalloc (ARG_HASH_SIZE * sizeof (char *));
 466       memset (arg_table, 0, ARG_HASH_SIZE * sizeof (char *));
 467       return 0;
 468     }
 469
 470   hash = ARG_HASH (arg);
 471   while (arg_table[hash] != NULL)
 472     {
 473       if (strcmp (arg, arg_table[hash]) == 0)
 474         return 1;
 475       /* We assume there won't be more than ARG_HASH_SIZE arguments so we
 476          don't check if the table is full.  */
 477       if (++hash == ARG_HASH_SIZE)
 478         hash = 0;
 479     }
 480   arg_table[hash] = arg;
 481   return 0;
 482 }
 483
 484 /* Called by sim_open to parse the arguments.  */
 485
 486 SIM_RC
 487 sim_parse_args (sd, argv)
 488      SIM_DESC sd;
 489      char **argv;
 490 {
 491   int c, i, argc, num_opts;
 492   char *p, *short_options;
 493   /* The `val' option struct entry is dynamically assigned for options that
 494      only come in the long form.  ORIG_VAL is used to get the original value
 495      back.  */
 496   int *orig_val;
 497   struct option *lp, *long_options;
 498   const struct option_list *ol;
 499   const OPTION *opt;
 500   OPTION_HANDLER **handlers;
 501   sim_cpu **opt_cpu;
 502
 503   /* Count the number of arguments.  */
 504   for (argc = 0; argv[argc] != NULL; ++argc)
 505     continue;
 506
 507   /* Count the number of options.  */
 508   num_opts = 0;
 509   for (ol = STATE_OPTIONS (sd); ol != NULL; ol = ol->next)
 510     for (opt = ol->options; OPTION_VALID_P (opt); ++opt)
 511       ++num_opts;
 512   for (i = 0; i < MAX_NR_PROCESSORS; ++i)
 513     for (ol = CPU_OPTIONS (STATE_CPU (sd, i)); ol != NULL; ol = ol->next)
 514       for (opt = ol->options; OPTION_VALID_P (opt); ++opt)
 515         ++num_opts;
 516
 517   /* Initialize duplicate argument checker.  */
 518   (void) dup_arg_p (NULL);
 519
 520   /* Build the option table for getopt.  */
 521
 522   long_options = NZALLOC (struct option, num_opts + 1);
 523   lp = long_options;
 524   short_options = NZALLOC (char, num_opts * 3 + 1);
 525   p = short_options;
 526   handlers = NZALLOC (OPTION_HANDLER *, OPTION_START + num_opts);
 527   orig_val = NZALLOC (int, OPTION_START + num_opts);
 528   opt_cpu = NZALLOC (sim_cpu *, OPTION_START + num_opts);
 529
 530   /* Set '+' as first char so argument permutation isn't done.  This
 531      is done to stop getopt_long returning options that appear after
 532      the target program.  Such options should be passed unchanged into
 533      the program image. */
 534   *p++ = '+';
 535
 536   for (i = OPTION_START, ol = STATE_OPTIONS (sd); ol != NULL; ol = ol->next)
 537     for (opt = ol->options; OPTION_VALID_P (opt); ++opt)
 538       {
 539         if (dup_arg_p (opt->opt.name))
 540           continue;
 541         if (opt->shortopt != 0)
 542           {
 543             *p++ = opt->shortopt;
 544             if (opt->opt.has_arg == required_argument)
 545               *p++ = ':';
 546             else if (opt->opt.has_arg == optional_argument)
 547               { *p++ = ':'; *p++ = ':'; }
 548             handlers[(unsigned char) opt->shortopt] = opt->handler;
 549             if (opt->opt.val != 0)
 550               orig_val[(unsigned char) opt->shortopt] = opt->opt.val;
 551             else
 552               orig_val[(unsigned char) opt->shortopt] = opt->shortopt;
 553           }
 554         if (opt->opt.name != NULL)
 555           {
 556             *lp = opt->opt;
 557             /* Dynamically assign `val' numbers for long options. */
 558             lp->val = i++;
 559             handlers[lp->val] = opt->handler;
 560             orig_val[lp->val] = opt->opt.val;
 561             opt_cpu[lp->val] = NULL;
 562             ++lp;
 563           }
 564       }
 565
 566   for (c = 0; c < MAX_NR_PROCESSORS; ++c)
 567     {
 568       sim_cpu *cpu = STATE_CPU (sd, c);
 569       for (ol = CPU_OPTIONS (cpu); ol != NULL; ol = ol->next)
 570         for (opt = ol->options; OPTION_VALID_P (opt); ++opt)
 571           {
 572 #if 0 /* Each option is prepended with --<cpuname>- so this greatly cuts down
 573          on the need for dup_arg_p checking.  Maybe in the future it'll be
 574          needed so this is just commented out, and not deleted.  */
 575             if (dup_arg_p (opt->opt.name))
 576               continue;
 577 #endif
 578             /* Don't allow short versions of cpu specific options for now.  */
 579             if (opt->shortopt != 0)
 580               {
 581                 sim_io_eprintf (sd, "internal error, short cpu specific option");
 582                 return SIM_RC_FAIL;
 583               }
 584             if (opt->opt.name != NULL)
 585               {
 586                 char *name;
 587                 *lp = opt->opt;
 588                 /* Prepend --<cpuname>- to the option.  */
 589                 asprintf (&name, "%s-%s", CPU_NAME (cpu), lp->name);
 590                 lp->name = name;
 591                 /* Dynamically assign `val' numbers for long options. */
 592                 lp->val = i++;
 593                 handlers[lp->val] = opt->handler;
 594                 orig_val[lp->val] = opt->opt.val;
 595                 opt_cpu[lp->val] = cpu;
 596                 ++lp;
 597               }
 598           }
 599     }
 600
 601   /* Terminate the short and long option lists.  */
 602   *p = 0;
 603   lp->name = NULL;
 604
 605   /* Ensure getopt is initialized.  */
 606   optind = 0;
 607
 608   while (1)
 609     {
 610       int longind, optc;
 611
 612       optc = getopt_long (argc, argv, short_options, long_options, &longind);
 613       if (optc == -1)
 614         {
 615           if (STATE_OPEN_KIND (sd) == SIM_OPEN_STANDALONE)
 616             STATE_PROG_ARGV (sd) = dupargv (argv + optind);
 617           break;
 618         }
 619       if (optc == '?')
 620         return SIM_RC_FAIL;
 621
 622       if ((*handlers[optc]) (sd, opt_cpu[optc], orig_val[optc], optarg, 0/*!is_command*/) == SIM_RC_FAIL)
 623         return SIM_RC_FAIL;
 624     }
 625
 626   return SIM_RC_OK;
 627 }
 628
 629 /* Utility of sim_print_help to print a list of option tables.  */
 630
 631 static void
 632 print_help (SIM_DESC sd, sim_cpu *cpu, const struct option_list *ol, int is_command)
 633 {
 634   const OPTION *opt;
 635
 636   for ( ; ol != NULL; ol = ol->next)
 637     for (opt = ol->options; OPTION_VALID_P (opt); ++opt)
 638       {
 639         const int indent = 30;
 640         int comma, len;
 641         const OPTION *o;
 642
 643         if (dup_arg_p (opt->opt.name))
 644           continue;
 645
 646         if (opt->doc == NULL)
 647           continue;
 648
 649         if (opt->doc_name != NULL && opt->doc_name [0] == '\0')
 650           continue;
 651
 652         sim_io_printf (sd, "  ");
 653
 654         comma = 0;
 655         len = 2;
 656
 657         /* list any short options (aliases) for the current OPT */
 658         if (!is_command)
 659           {
 660             o = opt;
 661             do
 662               {
 663                 if (o->shortopt != '\0')
 664                   {
 665                     sim_io_printf (sd, "%s-%c", comma ? ", " : "", o->shortopt);
 666                     len += (comma ? 2 : 0) + 2;
 667                     if (o->arg != NULL)
 668                       {
 669                         if (o->opt.has_arg == optional_argument)
 670                           {
 671                             sim_io_printf (sd, "[%s]", o->arg);
 672                             len += 1 + strlen (o->arg) + 1;
 673                           }
 674                         else
 675                           {
 676                             sim_io_printf (sd, " %s", o->arg);
 677                             len += 1 + strlen (o->arg);
 678                           }
 679                       }
 680                     comma = 1;
 681                   }
 682                 ++o;
 683               }
 684             while (OPTION_VALID_P (o) && o->doc == NULL);
 685           }
 686
 687         /* list any long options (aliases) for the current OPT */
 688         o = opt;
 689         do
 690           {
 691             const char *name;
 692             const char *cpu_prefix = cpu ? CPU_NAME (cpu) : NULL;
 693             if (o->doc_name != NULL)
 694               name = o->doc_name;
 695             else
 696               name = o->opt.name;
 697             if (name != NULL)
 698               {
 699                 sim_io_printf (sd, "%s%s%s%s%s",
 700                                comma ? ", " : "",
 701                                is_command ? "" : "--",
 702                                cpu ? cpu_prefix : "",
 703                                cpu ? "-" : "",
 704                                name);
 705                 len += ((comma ? 2 : 0)
 706                         + (is_command ? 0 : 2)
 707                         + strlen (name));
 708                 if (o->arg != NULL)
 709                   {
 710                     if (o->opt.has_arg == optional_argument)
 711                       {
 712                         sim_io_printf (sd, " [%s]", o->arg);
 713                         len += 2 + strlen (o->arg) + 1;
 714                       }
 715                     else
 716                       {
 717                         sim_io_printf (sd, " %s", o->arg);
 718                         len += 1 + strlen (o->arg);
 719                       }
 720                   }
 721                 comma = 1;
 722               }
 723             ++o;
 724           }
 725         while (OPTION_VALID_P (o) && o->doc == NULL);
 726
 727         if (len >= indent)
 728           {
 729             sim_io_printf (sd, "\n%*s", indent, "");
 730           }
 731         else
 732           sim_io_printf (sd, "%*s", indent - len, "");
 733
 734         /* print the description, word wrap long lines */
 735         {
 736           const char *chp = opt->doc;
 737           unsigned doc_width = 80 - indent;
 738           while (strlen (chp) >= doc_width) /* some slack */
 739             {
 740               const char *end = chp + doc_width - 1;
 741               while (end > chp && !isspace (*end))
 742                 end --;
 743               if (end == chp)
 744                 end = chp + doc_width - 1;
 745               sim_io_printf (sd, "%.*s\n%*s", end - chp, chp, indent, "");
 746               chp = end;
 747               while (isspace (*chp) && *chp != '\0')
 748                 chp++;
 749             }
 750           sim_io_printf (sd, "%s\n", chp);
 751         }
 752       }
 753 }
 754
 755 /* Print help messages for the options.  */
 756
 757 void
 758 sim_print_help (sd, is_command)
 759      SIM_DESC sd;
 760      int is_command;
 761 {
 762   if (STATE_OPEN_KIND (sd) == SIM_OPEN_STANDALONE)
 763     sim_io_printf (sd, "Usage: %s [options] program [program args]\n",
 764                    STATE_MY_NAME (sd));
 765
 766   /* Initialize duplicate argument checker.  */
 767   (void) dup_arg_p (NULL);
 768
 769   if (STATE_OPEN_KIND (sd) == SIM_OPEN_STANDALONE)
 770     sim_io_printf (sd, "Options:\n");
 771   else
 772     sim_io_printf (sd, "Commands:\n");
 773
 774   print_help (sd, NULL, STATE_OPTIONS (sd), is_command);
 775   sim_io_printf (sd, "\n");
 776
 777   /* Print cpu-specific options.  */
 778   {
 779     int i;
 780
 781     for (i = 0; i < MAX_NR_PROCESSORS; ++i)
 782       {
 783         sim_cpu *cpu = STATE_CPU (sd, i);
 784         if (CPU_OPTIONS (cpu) == NULL)
 785           continue;
 786         sim_io_printf (sd, "CPU %s specific options:\n", CPU_NAME (cpu));
 787         print_help (sd, cpu, CPU_OPTIONS (cpu), is_command);
 788         sim_io_printf (sd, "\n");
 789       }
 790   }
 791
 792   sim_io_printf (sd, "Note: Depending on the simulator configuration some %ss\n",
 793                  STATE_OPEN_KIND (sd) == SIM_OPEN_STANDALONE ? "option" : "command");
 794   sim_io_printf (sd, "      may not be applicable\n");
 795
 796   if (STATE_OPEN_KIND (sd) == SIM_OPEN_STANDALONE)
 797     {
 798       sim_io_printf (sd, "\n");
 799       sim_io_printf (sd, "program args    Arguments to pass to simulated program.\n");
 800       sim_io_printf (sd, "                Note: Very few simulators support this.\n");
 801     }
 802 }
 803
 804 /* Utility of sim_args_command to find the closest match for a command.
 805    Commands that have "-" in them can be specified as separate words.
 806    e.g. sim memory-region 0x800000,0x4000
 807    or   sim memory region 0x800000,0x4000
 808    If CPU is non-null, use its option table list, otherwise use the main one.
 809    *PARGI is where to start looking in ARGV.  It is updated to point past
 810    the found option.  */
 811
 812 static const OPTION *
 813 find_match (SIM_DESC sd, sim_cpu *cpu, char *argv[], int *pargi)
 814 {
 815   const struct option_list *ol;
 816   const OPTION *opt;
 817   /* most recent option match */
 818   const OPTION *matching_opt = NULL;
 819   int matching_argi = -1;
 820
 821   if (cpu)
 822     ol = CPU_OPTIONS (cpu);
 823   else
 824     ol = STATE_OPTIONS (sd);
 825
 826   /* Skip passed elements specified by *PARGI.  */
 827   argv += *pargi;
 828
 829   for ( ; ol != NULL; ol = ol->next)
 830     for (opt = ol->options; OPTION_VALID_P (opt); ++opt)
 831       {
 832         int argi = 0;
 833         const char *name = opt->opt.name;
 834         if (name == NULL)
 835           continue;
 836         while (argv [argi] != NULL
 837                && strncmp (name, argv [argi], strlen (argv [argi])) == 0)
 838           {
 839             name = &name [strlen (argv[argi])];
 840             if (name [0] == '-')
 841               {
 842                 /* leading match ...<a-b-c>-d-e-f - continue search */
 843                 name ++; /* skip `-' */
 844                 argi ++;
 845                 continue;
 846               }
 847             else if (name [0] == '\0')
 848               {
 849                 /* exact match ...<a-b-c-d-e-f> - better than before? */
 850                 if (argi > matching_argi)
 851                   {
 852                     matching_argi = argi;
 853                     matching_opt = opt;
 854                   }
 855                 break;
 856               }
 857             else
 858               break;
 859           }
 860       }
 861
 862   *pargi = matching_argi;
 863   return matching_opt;
 864 }
 865
 866 SIM_RC
 867 sim_args_command (SIM_DESC sd, char *cmd)
 868 {
 869   /* something to do? */
 870   if (cmd == NULL)
 871     return SIM_RC_OK; /* FIXME - perhaphs help would be better */
 872
 873   if (cmd [0] == '-')
 874     {
 875       /* user specified -<opt> ... form? */
 876       char **argv = buildargv (cmd);
 877       SIM_RC rc = sim_parse_args (sd, argv);
 878       freeargv (argv);
 879       return rc;
 880     }
 881   else
 882     {
 883       char **argv = buildargv (cmd);
 884       const OPTION *matching_opt = NULL;
 885       int matching_argi;
 886       sim_cpu *cpu;
 887
 888       if (argv [0] == NULL)
 889         return SIM_RC_OK; /* FIXME - perhaphs help would be better */
 890
 891       /* First check for a cpu selector.  */
 892       {
 893         char *cpu_name = xstrdup (argv[0]);
 894         char *hyphen = strchr (cpu_name, '-');
 895         if (hyphen)
 896           *hyphen = 0;
 897         cpu = sim_cpu_lookup (sd, cpu_name);
 898         if (cpu)
 899           {
 900             /* If <cpuname>-<command>, point argv[0] at <command>.  */
 901             if (hyphen)
 902               {
 903                 matching_argi = 0;
 904                 argv[0] += hyphen - cpu_name + 1;
 905               }
 906             else
 907               matching_argi = 1;
 908             matching_opt = find_match (sd, cpu, argv, &matching_argi);
 909             /* If hyphen found restore argv[0].  */
 910             if (hyphen)
 911               argv[0] -= hyphen - cpu_name + 1;
 912           }
 913         free (cpu_name);
 914       }
 915
 916       /* If that failed, try the main table.  */
 917       if (matching_opt == NULL)
 918         {
 919           matching_argi = 0;
 920           matching_opt = find_match (sd, NULL, argv, &matching_argi);
 921         }
 922
 923       if (matching_opt != NULL)
 924         {
 925           switch (matching_opt->opt.has_arg)
 926             {
 927             case no_argument:
 928               if (argv [matching_argi + 1] == NULL)
 929                 matching_opt->handler (sd, cpu, matching_opt->opt.val,
 930                                        NULL, 1/*is_command*/);
 931               else
 932                 sim_io_eprintf (sd, "Command `%s' takes no arguments\n",
 933                                 matching_opt->opt.name);
 934               break;
 935             case optional_argument:
 936               if (argv [matching_argi + 1] == NULL)
 937                 matching_opt->handler (sd, cpu, matching_opt->opt.val,
 938                                        NULL, 1/*is_command*/);
 939               else if (argv [matching_argi + 2] == NULL)
 940                 matching_opt->handler (sd, cpu, matching_opt->opt.val,
 941                                        argv [matching_argi + 1], 1/*is_command*/);
 942               else
 943                 sim_io_eprintf (sd, "Command `%s' requires no more than one argument\n",
 944                                 matching_opt->opt.name);
 945               break;
 946             case required_argument:
 947               if (argv [matching_argi + 1] == NULL)
 948                 sim_io_eprintf (sd, "Command `%s' requires an argument\n",
 949                                 matching_opt->opt.name);
 950               else if (argv [matching_argi + 2] == NULL)
 951                 matching_opt->handler (sd, cpu, matching_opt->opt.val,
 952                                        argv [matching_argi + 1], 1/*is_command*/);
 953               else
 954                 sim_io_eprintf (sd, "Command `%s' requires only one argument\n",
 955                                 matching_opt->opt.name);
 956             }
 957           freeargv (argv);
 958           return SIM_RC_OK;
 959         }
 960
 961       freeargv (argv);
 962     }
 963
 964   /* didn't find anything that remotly matched */
 965   return SIM_RC_FAIL;
 966 }